Agilent Technologies 11645A Series, User'S And Service Manual

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11645A 3-5
Use, Maintenance, and Care of the Devices
Connections
Connections
Good connections require a skilled operator. Instrument sensitivity and mechanical
tolerances are such that slight errors in operator technique can have a significant effect on
measurements and measurement uncertainties. The most common cause of measurement
error is bad connections.
Connecting Waveguide Devices
IMPORTANT Unlike threaded devices, the WR-28, WR-22, WR-19, WR-15, and WR-10
waveguide mating planes are flanges (often precision) that you must carefully
screw together. Always connect waveguide in the same flange orientation. For
example, use the label as a reference and always connect a device with the
label facing the same direction.
The following procedures illustrate how to make good connections.
How to Connect:
R-band WR-28
Always connect the waveguide with the same flange orientation. For example, always
connect a device with the label facing the same direction.
Follow theses recommendations for optimum connection technique:
1. Place two alignment pins (with heads) in opposite holes of each flange. For example, one
in the top left, and one in the bottom right.
2. Using the pins as guides, carefully align the flanges, and insert screws in the two open
corner holes.
3. Place a lock washer and nut on each screw, and finger tighten.
4. Remove the alignment pins and insert the remaining two screws.
5. Place a lock washer and nut on each screw, and finger tighten.
6. Inspect each lock washer to be sure they are similarly compressed.
7. In an X pattern (for equal compression), use the hex ball driver to tighten all four
screws. Do not over-tighten.
NOTE
Apply symmetrical pressure as you gradually tighten the screws.
8. Visually inspect the connection:
a. Place an electric light or white paper behind the connection.